picam.py

from picamera import PiCamera
from picamera.array import PiRGBArray
from threading import Thread


class camera:
    def __init__(self, resolution=(320, 240), framerate=32):
        self.cam = PiCamera()
        self.cam.resolution = resolution
        self.cam.framerate = framerate
        self.rawCapture = PiRGBArray(self.cam, size=resolution)
        self.stream = self.cam.capture_continuous(self.rawCapture, format="bgr", use_video_port=True)
        self.frame = None
        self.stopped = False
        self.paused = False

    def start(self):
        Thread(target=self.update, args=()).start()
        return self

    def update(self):
        for f in self.stream:
            while self.paused:
                pass
            self.frame = f.array
            self.rawCapture.truncate(0)
            if self.stopped:
                self.stream.close()
                self.rawCapture.close()
                self.cam.close()
                print("Camera Thread Stopped")
                return  

    def read(self):
        return self.frame
    
    def release(self):
        self.paused = False
        self.stopped = True

    def pause(self):
        self.paused = True
        
    def resume(self):
        self.paused = False